Womic Stainless Steel Co., Ltd
Universal Corrosion Resistance: Resists both reducing and oxidizing acids, wet chlorine, and chlorides.
Highest PRE (≥65): Outstanding pitting and crevice corrosion resistance.
No Sensitization: Low carbon plus Mo/W content – can be used as-welded without PWHT.
NACE MR0175: Qualified for highest H₂S partial pressure.
Full Range: Butt-weld (ASME B16.9), socket-weld (B16.11), threaded (NPT).
International Certifications: ASME, NACE, NORSOK, PED.
|
Standard |
Application |
Hastelloy C276 Grade |
|
ASME B16.9 |
Industrial butt-welding fittings (BW) |
UNS N10276 (WPHC276) |
|
ASME B16.11 |
Socket-welding and threaded fittings (SW / NPT) |
UNS N10276 |
|
ASTM B366 |
Factory-made wrought nickel alloy fittings |
WPHC276 |
|
MSS SP-43 |
Light-wall butt-welding fittings |
N10276 |
|
EN 10253-2 (Type B) |
European standard butt-welding fittings |
2.4819 (NiMo16Cr15W) |
|
EN 10253-4 |
European standard socket-welding fittings |
NiMo16Cr15W |
|
GB/T 12459 |
Chinese national standard seamless/welded fittings |
NS C276 |
|
Element |
Ni |
Cr |
Mo |
W |
Fe |
C |
Mn |
P |
S |
Si |
V |
Co |
|
C276 |
≥57.0 |
14.5–16.5 |
15.0–17.0 |
3.0–4.5 |
4.0–7.0 |
≤0.010 |
≤1.0 |
≤0.025 |
≤0.010 |
≤0.08 |
≤0.35 |
≤2.5 |
The combination of high molybdenum (15-17%) and tungsten (3-4.5%) gives C276 the highest PREN of any commercial alloy (≥65).
|
Property |
Unit |
Hastelloy C276 (Annealed) |
|
Tensile Strength |
MPa |
≥690 |
|
Yield Strength (0.2% offset) |
MPa |
≥310 |
|
Elongation |
% |
≥40 |
|
Hardness (Brinell) |
HBW |
≤250 |
|
Density |
g/cm³ |
8.89 |
|
Melting Range |
°C |
1320–1370 |
Heat
Treatment Condition:
All Hastelloy C276 fittings are solution annealed at 1120–1175°C followed
by immediate water
quenching. This treatment is mandatory to prevent intermetallic
phase precipitation.
|
Class |
Pressure Rating (psig) @ 100°F |
Pressure Rating (psig) @ 300°F |
Pressure Rating (psig) @ 500°F |
|
3000 LB |
2300 |
2100 |
1900 |
|
6000 LB |
4600 |
4200 |
3800 |
|
Fitting Type |
Main Forms |
Manufacturing Method |
|
Elbow |
45°, 90°, 180° LR |
Seamless / Forged |
|
Tee |
Equal, Reducing |
Seamless / Forged |
|
Cross |
Equal |
Fabricated |
|
Reducer |
Concentric, Eccentric |
Seamless / Forged |
|
Cap |
Flat |
Forged |
|
Stub End |
Long type |
Seamless |
|
Nipple |
Threaded ends |
Machined |
|
Parameter |
Butt-Weld Fittings (BW) |
Socket-Weld / Threaded Fittings (SW / NPT) |
|
Nominal Size (DN/NPS) |
1/2″ – 12″ (larger via fabrication) |
1/8″ – 4″ |
|
Wall Thickness Schedule |
Sch10S, Sch40S, Sch80S |
3000LB, 6000LB |
|
Manufacturing Process |
Seamless (≤6″) / Fabricated (>6″) |
Forging + Machining |
Raw Material Selection: Premium C276 billet from Haynes International or VDM Metals.
Cutting & Heating: Precise cutting; careful temperature control.
Forming: Hot forging (narrow temperature window).
Solution Annealing: 1120–1175°C + immediate water quench (<30 sec).
Machining & Beveling: Precision machining.
Pickling & Passivation: Special pickling to avoid hydrogen pickup.
Marking & Inspection: Laser marking with full traceability.
|
Surface Finish |
Description |
|
Annealed & Pickled (AP) |
Only acceptable finish for C276 (no bright annealing). |
|
Passivated |
Recommended for acid service. |
Chemical Analysis: PMI for Ni, Cr, Mo, W.
Mechanical Testing: Tensile, yield, elongation, hardness.
NDT: 100% Penetrant Testing; UT/RT optional.
Corrosion Testing: ASTM G28 intergranular; ASTM G48 pitting.
Sour Service: NACE MR0175 HIC/SSC upon request.
Third-Party: SGS, BV, DNV, TUV.
Wet Chlorine & Hypochlorite: Gas drying towers, bleaching chemical lines.
Hydrochloric Acid Service: HCl vapor lines, acid regeneration.
Flue Gas Desulfurization (FGD): Reheater ducting, spray headers.
Pharmaceutical: API reactors, high-purity aggressive chemical lines.
Sour Gas (HP H₂S/CO₂): Wellhead flowlines, choke manifold fittings.
Wooden crates with foam padding and VCI paper.
End caps for all BW ends; thread protectors for NPT.
Strict contamination avoidance.
Small stock for 1/2″–8″ BW sizes.
1. Can
C276 be field welded without PWHT?
Yes, because of extremely low carbon and stabilized structure.
2. Is C276
resistant to ferric chloride?
Yes, its PRE ≥65 makes it suitable for ferric chloride solutions.
3. How to
avoid hydrogen embrittlement during pickling?
Use properly controlled pickling baths; Womic ensures no over-pickling.
Only genuine Haynes / VDM sourced C276.
Experienced in critical chemical and FGD applications.
Fast custom production for non-stock sizes.
Full traceability and NACE documentation.
Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568
E-mail: info@womicstainless.com
Website: www.womicsteel.com
Contact Womic Steel today for a competitive quote on Hastelloy C276 stainless steel pipe fittings. We offer certified quality, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.
Stock Examples:
90° LR Elbow: 2″ Sch40S, 4″ Sch10S
Equal Tee: 4″×4″ Sch10S, 2″×2″ Sch80S
Concentric Reducer: 6″×4″ Sch80S, 4″×2″ Sch40S
Cap: 8″ Sch40S
Related
Keywords:
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